Six internet and web service stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

Commtouch Software Ltd (CTCH) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. Commtouch Software provides messaging, antivirus, and Web security solutions to OEM customers, enterprises, and service providers primarily in Israel, North America, Europe, and Asia. In Portfolio Grader’s specific subcategory of Sales Growth, CTCH also gets an A. For more information, get Portfolio Grader’s complete analysis of CTCH stock.

IntraLinks Holdings, Inc. (IL) is seeing ratings go up from a C last week to a B this week. IntraLinks Holdings provides Software-as-a-Service solutions for managing content, exchanging business information and collaborating within and among organizations. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. For more information, get Portfolio Grader’s complete analysis of IL stock.

This is a strong week for Sohu.com, Inc. (SOHU). The company’s rating climbs to B from the previous week’s C. Sohu.com is an Internet media company that serves as a daily source of information, communication and entertainment for millions of Chinese consumers. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of SOHU stock.

This week, Akamai Technologies, Inc.’s (AKAM) ratings are up from a C last week to a B. Akamai Technologies provides services for accelerating and improving the delivery of content and applications over the Internet. For more information, get Portfolio Grader’s complete analysis of AKAM stock.

OpenTable, Inc. (OPEN) improves from a C to a B rating this week. OpenTable provides free, real-time online restaurant reservations for diners through an online booking service. For more information, get Portfolio Grader’s complete analysis of OPEN stock.

This week, Jiayuan.com International Ltd. Sponsored ADR (DATE) pushes up from a C to a B rating. Jiayuan. com International is an online Chinese dating company. For more information, get Portfolio Grader’s complete analysis of DATE stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.