Squarespace is an independent website hosting company. It means that they used a template from Squarespace and did not correctly update all the fields. (In other words, it's an honest mistake.)
Sloppy, but fair enough. I had hoped it was only something like that.
The twitter one I can answer too - if you follow someone there's a good chance they will follow you back, so the more people you follow, the more followers you get. It's one of the ways to get followers quickly.
I see. I find that distasteful, but I guess it's expected behavior for a marketing firm.