This idea is adapted from an activity in Going Mobile, the latest book from Nicky Hockly & Gavin Dudeney http://www.emoderationskills.com/?p=1323 called Twitter Celebrities.
If some learners don’t already have a Twitter account then classmates can show them how to set one up and explain how it works.
Prompt your learners to think of a famous person that interests them and who tweets in English (sports personality, actor/tress, politician singer, T.V. personality).
The learners ‘follow’ the celebrity on a daily basis and once or twice a week as classes permit, allow students 10-15 minutes to discuss in groups/pairs the tweets and activities of their celebrity.
This encourages students to engage with English outside of the classroom using technology that they may already use regularly in their L1.
If you try this activity, let me know how it goes in the comments!