The argument is that the Russians helped Trump in three ways:
1) Through social media, Facebook, Twitter, etc. by creating fake news, fake supporters (bots). This is a fact. It did happen.
2) Support of hacks and one-sided leaks that lead to the release of DNC emails, but not RNC emails. There is strong evidence that Russia did the hacks and Wikileaks was used as a tool to release emails.
3) Direct support through business and social contacts that supplied them with dirt on Hillary. If you had been paying attention, you know there is direct evidence that there was some collusion between members of the Trump campaign and agents of the Russian government. Whether this got to DJT's level is yet to be seen, but he is sure acting guilty, he openly asked for Russian help finding Clinton emails, and he seemed to know when Wikileaks was going to leak something before they did it.
While it is technically possible they helped Hillary over Bernie (she didn't need much help with support from the DNC and "Super Delegates"), social media did not effectively exist at the time of the Bill Clinton presidential runs. Wikileaks did not exist during the Clinton presidency and in the 90s emails where just becoming a thing.
The Clintons don't travel in the same circles as as the Russian oligarchs, and the Clinton Foundation, their tool for peddling influence did not exist until the end of Bill's was presidency. In the 90s Russia had just overthrown communism and were dealing with their new country. Yeltsin was president and was a different sort of person than Putin.
Finally, Putin personally hates Clinton and it is unlikely he would help her. There would have been zero benefit to Russian for Clinton to be President.
While the Russians may have used technology and influence to help Trump by garnering support for him and disdain for Clinton, there really is not enough evidence to suggest that it made the difference in election. Trump won because Clinton lost.