Virtually tying overposting as a top reason for unliking a brand on Facebook is having an overcrowded wall (43%, more than one answer permitted). Other leading reasons include content becoming boring and/or repetitive (38%), and only liking a company to take advantage of a one-time offer (26%).

Report data indicates brands will often know when a Facebook fan changes their mind, as 43% of Facebook users will unlike a brand when they no longer want to see its posts. Another 38% click the “X” in their news feed so they don’t see the brand’s posts and 19% do nothing but ignore the posts.

Fifty-five percent of Facebook users have liked a company and then decided they no longer wanted to see its posts. In addition, 51% say they rarely or never visit a brand once they have liked it. A full 71% of fans say they have become more selective about what brands they like.

Report data show that a consumer’s decision to “unlike” a company has surprisingly little impact on the perceived likelihood that they will buy from that company in the future. In total, 63% of consumers said they were as likely or more likely to purchase something from a company after ending their Facebook relationship. Another 18% said they only “unlike” a company if they never bought anything in the first place.

Almost three in four (73%) online US consumers have opened a Facebook account. Sixty-five percent are active Facebook users, and 42% are fans. The fan percentage rises to 64% among Facebook users.

Facebook represents the largest share of time spent by US internet users of the top five most-visited websites, according to a new white paper from comScore. “The 2010 US Digital Year in Review” indicates that Facebook increased its share of total US internet time 71% between December 2009 (7.2%) and December 2010 (12.3%).

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