1. Networking: The old saying 'Its not what you know, but rather who you know' is still relevant today, however the platform needed to know people has changed, it is no longer necessary to meet someone face to face to be able to consider them a contact, an on-line relationship is often just as valuable.
2. Quick Feedback: In first year when doing some additional reading, I emailed several researchers asking them questions about their paper and never got a single response, when I did the same in second year, but tweeted instead of emailing I often got a response the same day.
3. Opportunities: When I sent out a tweet saying how much my Filofax had helped me stay organised during second year, I was sent a money off voucher. I have also been approached by the Guardian newspaper to answer questions about how I used social media to help me pick which University I wanted to go to. All very small things, but there is definitely an opportunity to use the platform of Twitter to help you progress your career and make contact with people and brands that you wouldn't otherwise have the opportunity for.
Being in my final year of University, I am very aware of how I come across on-line and the things that potential employers may have access to. However I don't think it is ever too early in your University career to start making contacts and tweeting about the things that you are interested on both a personal and professional level.
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Make sure you're following the Twitter page for the module to keep up to date with the latest goings on: not only with the module and university, but also within the wider scientific community!