Ask them how they want Citizens to report. Most will accept a phone call.
When you see hail, damaging wind, flood, ice storms, etc., CALL the local office.
They also follow on Twitter and Facebook a lot. Tag them in your post. @NWSTulsa, for example, is the Tulsa NWS office on Twitter and Facebook. How selfish is it of you to tag your friends while disregarding the place that can give the warning to your friends and your neighbors?
Hashtags are also a good way to use social media. #XXwx where XX is the two letter identifier for your State, ex. KSwx
Photos also tell a thousand words. That hail stone looks great next to a ruler or a quarter.
Be part of your community. Report your weather to the NWS and your local emergency manager. Maybe we can all get a good rest if there are fewer radar indicated storms, maybe.