I'm not sure if Toms is blatantly lying or if they just haven't done their due diligence.
SOPA DOES NOT affect sites hosted in the US, nor does it affect any foreign sites with a .net, .com, or .org domain name. Those are all governed by the DMCA. So it won't affect Toms, Facebook, YouTube, or Twitter. This information is very easily accessible, so Toms has no proof to back up their claim.
http://www.theverge.com/2011/12/22/2648219/stop-online-piracy-act-sopa-what-is-it
http://thomas.loc.gov/cgi-bin/query/z?c112:H.R.3261:
While the intention is good (a bill like this is needed), the changes being proposed to the DNS system as well as the possible impact it will have on up-and-coming bill processors are too steep.