WordPress.com don’t support any types of Javascript and thus you can’t able to use any javascript based social bookmarks for your posts. If you’re to share with all networks – it’s bit tricky but friends and easy to use. Just use Social Poster and thus you can able to add 75 different social networks in below of every posts. So, your visitor can share with others just a click away.

In Social Poster you have to sumit your posts url, title, some texts, tags and then select your desired social bookmarks from left side and then press submit. That’s it. After that, you will get like one Submit to Social Websites just add this text in below to your site. On that page user can get the scope to bookmark your posts. For extra you can see the posts Page Rank, Alexa ranks too.