I have started testing stuff on the testnet for a week now and I have this question:

Wtf is bloating up the blocks? I see most blocks being full, up to 1mb, and bloated up by a chain of txs that are spent in the same block: as soon as one output is created it is spent in the next tx and so one in a long chain of txs. What is this?

Also what advice would you guys give to a newcomer when working with the testnet? (i have worked with ethereum extensively before and i know how btc works but i haven`t touched the tools much before; atm i am experimenting with bitcoind and bitcoinjs-lib)