Stefan Sperling is a user on mastodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
Stefan Sperling @stsp

More test hiking for the t2k17 post-hackathon hike. On a hill in southern Germany this time. mastodon.social/media/uLSL9mSo

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@Vigdis nothing fancy. i will show you in toronto