Mixx is steadily growing, and they’re hoping to spur even greater traffic increases with a completely revamped website. But every social news service is showing growth, and Mixx actually appears to be lagging if you compare publicly available data.

Last time we wrote about Mixx, they were touting healthy traffic numbers and boasting the fact that Hitwise report suggested that its users are more mainstream than those of their main competitor Digg. Today, the company says its visitor numbers have increased to about 7 million per month (citing January figures), which is up from 5.8 million in October 2008.

Meanwhile, all the big social news and discovery services are showing healthy growth, and Mixx appears to still play in the minor leagues. Take a look at this snapshot from Compete, for example, which show Digg is thriving and Reddit is steadily outpacing Mixx. Google Trends paints a slightly different picture but still pegs Digg, Reddit and StumbleUpon to be more popular than Mixx. Quantcast, finally, says Mixx receives about a 1/5 of the amount of visitors Digg does.