As you spend more time on Twitter, statistically, you’ll eventually be a spam target. Spam is anyone who games the system to get more followers and add no value, companies that don’t interact but force feed followers links to sales pitches or people pimping their adult sites.
To avoid spam, if you’re unsure if you should follow someone back or not, check out TwitChuck, enter their twitter name and hit enter. You’ll get a yes, no or maybe like you see below. I think the algorithm needs some work, there are some users it didn’t recommend and it doesn’t recognize private accounts (like mine, even though Hubspot does), so I look forward to seeing how it develops out.
Screenshots of TwitChuck’s suggestions:
Note: I don’t personally know the developers of this application, and I’m sure it’s fine, but I can’t guarantee the safety of logging in with your Twitter screen name (which is an option so you can follow people directly from TwitChuck). Always exercise caution when giving out passwords if not done directly through the Twitter interface.