(Bloomberg) -- Snapchat’s parent company is slashing staff and scaling back investments in straggling businesses, an attempt to rein in costs following a slowdown in ad revenue growth.Most Read from BloombergTrump Documents Bears Hallmarks of Close-Held US SecretsJapan to Allow Non-Guided Group Tours From SeptemberPowell Abandons Soft Landing Goal as He Seeks Growth RecessionTrump Records May Have Been Moved to Obstruct Probe, DOJ SaysSnap Inc. is cutting about 20% of its 6,400-person workforce,