The first phase in writing your social media marketing plan is research. Use the websites in this table to put together the best possible social media marketing plan for your company.

Website Description
Addict-o-matic Search for the current buzz and trends on any topic
BIG Marketing for Small Business Social media, online, and offline marketing tips
FrogLoop Online ROI calculator for social network campaigns
HubSpot Inbound Internet marketing blog
MarketingProfs Social media marketing tips, including B2B
MarketingSherpa Social networking research with B2B focus
Mashable Premier site for online news with social media focus
Online Marketing Blog Blog about online and social marketing
Practical eCommerce Blog about social marketing for retailers
Quantcast Demographic research on most sites
Social Media Marketing Group Professional discussion group; approval required to join
Social Mention Tracks post about topics on 100+ social media services
Social Networking Business Social networking blog for business development
Social Networking Watch Aggregates news and statistics for social networks
Technorati Real-time blog search engine and index of blog popularity

Bookmark any sites you find most useful to continue accessing after you have your social media marketing plan in place.