When you select more than one social network in the Composer, your post is published to all of those social networks.
If one profile is selected but posts are publishing multiple times or to multiple accounts, it could be because your Twitter and Facebook accounts are linked, which lets you automatically share your Facebook posts to Twitter.
You can tell if the accounts are linked by looking at the duplicate post in your Hootsuite dashboard. Duplicate tweets show via Facebook next to the timestamp.
To unlink your Twitter account from Facebook
- Log in to www.facebook.com/twitter with your Facebook credentials.
- Under your name and Linked to Twitter, select Unlink from Twitter.