1) Post regular updates to Twitter, but not too many. Some suggest that two to four updates per day is sufficient. To me, it depends on your purpose for tweeting. If you are a news organization, for example, regular updates are expected. If you are updating your status while on vacation, one or two a day should do it.
2) Interact with other Twitter users. Twitter is popular because it connects people to each other. It isn't just about what we as individuals have to say; it is also about contributing to other conversations and replying to popular threads or trending topics. It also means participating in Follow Friday (#FF) and Music Monday (#musicmonday).
3) Offer useful content. If you are constantly selling your products or services via Twitter, people will get tired of your updates unless you offer something else useful...like advice, links to interesting articles., etc. Post links to helpful articles, breaking news and pithy quotes in addition to your own updates.
By using these three techniques, your number of Twitter followers will grow and you'll not only receive interesting updates from interested followers but you'll grow your own online community. Happy Tweeting!
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