Go to Monitoring > Select Any one(Twitter) > New.
Select Twitter Hashtags as the Monitoring Method.

Type the hashtag you wish to monitor in the Twitter Hashtag box and the description.
Name the monitor and click save.

As people use the hashtag or mention that you’re monitoring, you’ll see them being added to your contact list. From there you can use that information in a Campaign.

NOTE: – You may configure the Twitter plugin and setup the social CRON to make it work.