In order to use Twitter for Pic Challenges you must connect the Twitter account of your choice.
The business Twitter handle will need to be used in all Tweets in order for them to qualify.
Your campaign has the ability to pull in mentions that were made "organically" as long as they use the configured hashtags below.
For Twitter, the organic mention text must also contain an @mention of an account that you control.
Connecting A Twitter Account
First, navigate to the Pic Challenge Page
You will see the following section. This is where you will connect your a Twitter account 
Simply click the Connect Twitter Account and after the credentials authorization from Twitter, you will see this.
Now when you create a new Pic Challenge there will be an option to use the Twitter Account.
Please note that the Twitter Tweet must include the business Twitter handle in order to qualify (see below)
Connecting Additional Twitter Accounts
If you wish to connect additional Twitter accounts just repeat the above process using different Twitter credentials that you control. Then when you are creating/editing a Pic Challenge, you can select the relevant Twitter account for the challenge (see below).
Using Twitter Accounts For Mentions
When the Twitter account is added to the Pic Challenge the Mentions feature will automatically connect the same Twitter account with an active status
Your campaign has the ability to pull in mentions that were made "organically" as long as they use the enabled Twitter account. This can be enabled/disabled by clicking the button in the Actions column.
The organic Mention text must also contain an @mention of an account that you control.
Additional Help
If you have any further questions or concerns, please do not hesitate to reach out to your account manager or email us at support@socialtoaster.com.