W3C Markup Validation Service errors

Nope In general, the social networks have their own requirements for how some things need to be set and we can't get around them. I looked at the errors being thrown and no browser anywhere would have any issues with those. Every browser is very familiar with standard syntax of social networks and common mistakes and has no problem working with what it sees.

Of course, if you run into any functional issues on your site, just let us know and we'll gladly investigate further.

Thanks,
Alex