Radio advertising isn't as powerful as it once was, but it's still an effective way to reach reasonably targeted demographics. Before you spend a dime on the medium, though, having a solid web presence is essential. If your site is clunky or your online visibility is weak, your radio ads could wind up benefiting your competitors more than you.

If you've been holding out on upgrading to the new Twitter interface, you no longer have any choice in the matter. The classic Twitter interface has been officially replaced by what the service calls New Twitter.

Reaching out to the media is a cost-effective way to spread the word about your enterprise. There are lots of paid and free press release distribution sites where you can submit your news, but most of them are fly-by-night services that aren't worth your time.

Here's a list of the best press release submission sites. If you have any recommendations, let us know in the comment section!

Since launching just over two weeks ago, Google+ has seen remarkable momentum. Official numbers haven't been released, but all accounts indicate that it's growing at an impressive rate. There are already millions of members using the service and its Android app. Early reviews of Google's latest stab at social networking have been favorable.

Given its popularity, businesses have been anxious to figure out how to use Google+ as a marketing tool. After initially telling brands to hold off on creating accounts, Google has fast-tracked plans to launch business pages because of the enormous interest in the platform. Many businesses that have created profiles have had their accounts purged; Ford Motor Co. is an apparent exception.

Google plans to award businesses with test accounts starting next week. Anyone interested has until Friday (July 15) to apply. To be considered, fill out this brief form.