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If you already use self-hosted WordPress or another tool — or aren't even blogging at all — this WordPress.com account won't affect any of it.
WordPress.com is now the account hub for all of our services at Automattic, including VaultPress, Polldaddy, and Akismet.
Polldaddy was acquired by Automattic in 2008, so your data is 100% safe with us — as it really isn't going anywhere.
Once you verify your email with WordPress.com, Polldaddy will ask for your existing account information. Enter it once, and you're done!