NEW YORK (TheStreet) -- Online harassment has "gotten worse for sure," Medium CEO and Twitter (TWTR) - Get Report co-founder Evan Williams said on BloombergTV's "Bloomberg West" on Tuesday evening. Evans currently sits on Twitter's board. 

"In the early days of the Internet, it was a little better. We felt like it's a big club and if you're there, then you're welcome," he said.  

If he knew how bad online bullying would get when he helped found social networking site Twitter in 2006, Evans said he would have tried to find a way to weed some of it out. 

"We would have thought about a different architecture for the service had we known how severe this issue was going to get. Because I think it really has gotten a lot worse in terms of the vitriol and the level of the severity of the attacks that some people suffer," he explained. 

But policing online harassment today is tricky because "the lines are fuzzy." Cracking down on online trolls seems a lot easier from the outside than when you actually look at the details of a particular instance.

In addition, the specific architecture of websites that allows for good things, unfortunately also allows for bad things, Evans said.  

"Because so many wonderful things come from online, there's a lot of desire to hold onto that ability and yet it causes so much problems when you open it up to the massive society," he explained. 

Even so, Twitter bans "lots of stuff" despite the general rhetoric that says otherwise, Evans said. The company has a "huge" team dedicated to preventing online harassment and it bans and deletes stuff "all the time," he added.

Twitter currently has a team working to improve the bullying issue on Twitter, Evans said. 

Shares of Twitter were higher in mid-morning trading on Wednesday. 

Separately, TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this articles's author.

TheStreet Ratings team rates Twitter as a Sell with a ratings score of D. This is driven by a number of negative factors, which the team believes should have a greater impact than any strengths, and could make it more difficult for investors to achieve positive results compared to most of the stocks the team covers.

You can view the full analysis from the report here: TWTR

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