Please add support for XING and/or custom link

Love your RSSocial! extension. It's simple and elegant. Just what we were looking for! However, here in Germany, XING is a very popular social platform (much like LinkedIn). It would be great if you could implement support for that in the not too distant future. Likewise it would be great if you could include the option to link to a custom page instead of the mailto link, i.e. a contact page. For this it would suffice if you would remove the email address validation from the field or make it either an email OR a custom link. Thank you so much in advance!