How to delete all the data?

The easiest way to reset is to delete the contents of the ‘Call to Action Box Template’ in the Socialize Display settings. Save your changes then deactivate/reactivate the plugin.

This was a quick fix to solve another problem and is the only way to reset until I implement a more elegant solution.

What other problems were you having with the plugin?

I am too having the same problem. I did what ‘Jon Bishop’ told – deleted whats there in the ‘Call to Action Box Template’ then saved it and then deactivated and reactivated the plugin. But still the same. The call to action text is same, the social icons are same and no new icons are being able to be added. Kindly help me completely delete this plugin from the database and then reinstall it.

I thought the first comment was about clearing the plugin settings. It seems your question is about changing the individual button settings for each page/post at once. This is currently not possible although it is at the top of my list of to-dos.