Exhibit 10.13

BLOCKED ACCOUNT PLEDGE AND CONTROL AGREEMENT

(Blocked Account – Exclusive Control by Secured Party)

This BLOCKED ACCOUNT PLEDGE AND CONTROL AGREEMENT (as the same may from time to time be amended, restated or otherwise modified, this “Agreement”) is made and entered into as of February 23, 2009, by and among JUPITERMEDIA CORPORATION, a Delaware corporation, to be known as WebMediaBrands Inc. (“Pledgor”), KEYBANK NATIONAL ASSOCIATION, in its capacity as a creditor of Pledgor, as more fully hereinafter described (“Secured Party”), and KEYBANK NATIONAL ASSOCIATION, as a depository bank (together with any other affiliate of KeyBank National Association that may from time to time hold the Blocked Account, as hereinafter defined, collectively, “Depository Bank”).

1. Recitals .

Pledgor and Secured Party entered into that certain Letter of Credit Reimbursement and Security Agreement, dated as of February 23, 2009, (as the same may from time to time be amended, restated or otherwise modified, the “LOC Agreement”), pursuant to which Secured Party has issued the letter of credit more specifically described in Exhibit A hereto (the “Remaining Letter of Credit”).

Pledgor has determined that it is in the business and financial interest of Pledgor that Secured Party continue to provide the Remaining Letter of Credit for the account of Pledgor.

Pledgor understands that Secured Party is willing to continue to provide the Remaining Letter of Credit only upon certain terms and conditions, one of which is that Pledgor grant to Secured Party a security interest in the Blocked Account, and this Agreement is being executed and delivered in consideration of the financial accommodations granted by Secured Party pursuant to the LOC Agreement and the Remaining Letter of Credit, and for other valuable consideration.

Pledgor has deposited Five Hundred Thousand Dollars ($500,000) into the Blocked Account, which funds are being held to secure the Obligations, as hereinafter defined.

2. Definitions . Except as otherwise specifically defined herein, terms that are defined in Chapter 1308 or Chapter 1309 of the Ohio Revised Code as in effect from time to time are used in this Agreement as so defined. As used herein, the following terms shall have the respective meanings indicated:

“Credit” means any letter of credit issued by Secured Party in accordance with the LOC Agreement.

“Blocked Account” means (a) account number 35698800002667 of Pledgor with Depository Bank, and (b) all cash, instruments, certificates of deposit (whether certificated or

uncertificated), and other cash equivalents of Pledgor held in such account from time to time, including but not limited to any interest earned on any of the foregoing.

“Document” means any paper, whether negotiable or non-negotiable, including, but not limited to all shipping documents, warehouse receipts, documents of title, (whether or not assigned), policies or certificates of insurance, and other documents, security invoices and certificates of insurance, and other documents, security, invoices and certificates accompanying or relating to drafts drawn under the Remaining Letter of Credit, shipped, stored, or otherwise disposed of in connection with the Remaining Letter of Credit.

“Obligations” means, collectively, (a) all amounts, reimbursement obligations, loans and other indebtedness and obligations now owing or hereafter incurred to Secured Party pursuant to the Remaining Letter of Credit, as provided for by the LOC Agreement; (b) each renewal, extension, consolidation or refinancing of any of the foregoing, in whole or in part; (c) all interest from time to time accruing on any of the foregoing, and all fees and other amounts owing to Secured Party pursuant to the Remaining Letter of Credit, as provided for by the LOC Agreement; (d) every other liability, now or hereafter owing to Secured Party pursuant to the Remaining Letter of Credit, the LOC Agreement or any other Document; and (e) all Related Expenses incurred in connection with any of the foregoing.

“Related Expenses” means any and all costs, liabilities and expenses (including, without limitation, losses, damages, penalties, claims, actions, reasonable attorneys’ fees, legal expenses, judgments, suits and disbursements) (a) incurred by, imposed upon or asserted against, Secured Party in any attempt by Secured Party to (i) obtain, preserve, perfect or enforce this Agreement or any security interest evidenced by this Agreement, (ii) obtain payment, performance or observance of any or all of the Obligations, or (iii) maintain, insure, audit, collect, preserve, repossess or dispose of any of the collateral securing the Obligations or any thereof, including, without limitation, costs and expenses for appraisals, assessments and audits of Pledgor or any such collateral; or (b) incidental or related to (a) above, including, without limitation, interest thereupon from the date incurred, imposed or asserted until paid.

3. Security Interest . Pledgor hereby grants to Secured Party a security interest in and an assignment of the Blocked Account, and pledges and assigns the Blocked Account to Secured Party, to secure the prompt and full payment and performance of the Obligations. Pledgor hereby irrevocably authorizes Secured Party at any time and from time to time, after the earlier to occur of (a) a violation by Pledgor of this Agreement, and (b) the occurrence of any one or more events of default, as provided for in the LOC Agreement, to cause any and all of the funds, credits and balances in the Blocked Account, including interest on the Blocked Accou