Mentioning brands is fine. Especially since you're not making money directly from this video in the sense of "selling" the actual video. The issue would be if you showed the trade marked logos.
Furthermore, as along as you're not bad mouthing these sites in a derogatory and untrue way there's nothing that they can sue you for. However, even if you did bad mouth the sites, as long as it wasn't something like "G00gle endorses molesting little boys" (defamation/libel) you're fine.
For the most part, in relation to your site, companies can only sue you if:
1) Their brand appears in your site URL (eg. facebookislame.com - this is still shady and the verdict is still out)
2) Defamation and Libel
3) You use their trademarks - unlicensed
4) You manipulate their site in some way (eg Hacking/spamming/fishing)
I might be missing one or two other minor instances, but for the most part this is the big picture.
Hope that helps
~Rookie