There was one fellow on IRC that was suggesting a campaign to unlike SOPA supporting companies on Facebook. My response was similar to yours – it'd be utterly

There was one fellow on IRC that was suggesting a campaign to unlike SOPA supporting companies on Facebook. My response was similar to yours – it'd be utterly useless (as is the majority of "internet activism"). However, once thinking along those lines, I suggested what might not be useless would be using the Reddit-ish sentiment to raise money for an advertising campaign targeted specifically at the home districts of the bill's sponsors (which would be easy on Facebook). I'd suspect it'd be easy to scrape together many thousands of dollars and then to smear the bill's sponsors in their home districts. (I haven't done this because honestly I haven't read a single page of the bill's text, don't even know what its implications are and refuse to protest something on a bandwagon.)