At the moment 1 Commun token worths 0,3$.

Thank you. How and where to exchange commun token?
1 commun token= ?? points

Can I cross-post my articles of Steemit in Commun?

You can exchange your Commun tokens to Community Points right in your wallet. The cost of the Points of each community is different. You can see their value in the wallet as well.
Of course, you can cross-post your articles of Steemit in Commun!