Once again we round up six of the best infographics we’ve seen this week.

The topics include email marketing best practices, Twitter, social CRM by numbers, Google+, and reasons to use video content in B2B marketing.

Email marketing best practices (Marketing Show)

Twitter cheat sheet (Linchpin SEO)

Social CRM by numbers (Eloqua)

Google+ image sizing cheatsheet (Global Web Design SEO)

Five reasons to use video in B2B marketing (Brainshark)

Online travel barometer (Affilinet)